#[rustversion::nightly] fn main() { println!("cargo:rerun-if-changed=build.rs"); println!("cargo:rustc-cfg=unstable_feature"); } #[rustversion::not(nightly)] fn main() { println!("cargo:rerun-if-changed=build.rs"); if cfg!(feature = "nautilus") { panic!("The 'nautilus' feature of libafl requires a nightly compiler"); } }